Related but not the same: does anyone have information on how the old T9 pre-smartphone system stored its compressed and fast dictionaries? I remember reading a

Related but not the same: does anyone have information on how the old T9 pre-smartphone system stored its compressed and fast dictionaries? I remember reading about it a long time ago but can't find it now. That system used some sort of lossy compression that created artifacts like fake words that don't exist but look enough like real words from the dictionary's point of view that they can be generated. I find it fascinating.